how to add a library to xcode

this has been asked plenty of times, but I always find them hard to follow. Its quite simple.
How do you add a library and/or framework to xcode and/ or your xcode project. I need all the steps between downloading the library, to typing the #include in the code. But I also need some context behind each step, other wise it won’t stick in my mind and I’ll back here in a week. Bear in mind I have an limited understanding of the xcode development environment. Thanks in advance.

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